<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    html,
    body {
      width: 100%;
      height: 100%;
      padding: 0;
      margin: 0;
    }

    .wx {
      width: 100%;

    }

    #app {
      width: 100%;
      height: 100%;
      display: flex;
    }

    .menu {
      width: 80px;
      background-color: #2d2b31;
      color: #fff;
    }

    .user {
      width: 300px;
      display: flex;
      flex-direction: column;
      background-color: #191919;
      color: #fff;
    }

    .search-bar,
    .title-bar {
      height: 60px;
      border-top: 1px solid #ccc;

    }

    .chat {
      flex: 1;
      display: flex;
      flex-direction: column;
    }

    .input-bar {
      height: 100px;
      border-top: 1px solid #ccc;
    }
  </style>
</head>

<body>
  <div id="app" class="wx">
    <div class="menu"></div>
    <div class="user">
      <div class="search-bar"></div>
      <div class="user-bar"></div>
    </div>
    <div class="chat">
      <div class="title-bar"></div>
      <div class="msg-bar"></div>
      <div class="input-bar"></div>
    </div>
  </div>
</body>

</html>
